辽河坳陷大民屯凹陷古近系盖层特征及对油气系统的影响  

Characteristics of the Paleogene caprock and influence on petroleum systems in Damintun Sag of Liaohe Depression

作　　者：孟卫工[1] 

机构地区：[1]西南石油学院资源与环境学院

出　　处：《古地理学报》2005年第1期25-33,共9页Journal of Palaeogeography：Chinese Edition

基　　金：国家重点科技攻关课题 (编号 2 0 0 1BA60 5A0 8-0 4)资助

摘　　要：辽河坳陷大民屯凹陷是著名的高凝油生产基地。从盖层分布特征、封盖性能等方面探讨两套区域盖层对油气富集的重要作用。通过流体超压研究 ,发现大民屯凹陷存在与两套区域盖层相对应的流体超压封盖系统。超压封盖对油气运聚有着重要作用。大民屯凹陷中可以划分为高蜡油油气系统和正常油油气系统两个含油系统。两套区域封盖体系分别对高蜡油和正常油的油气系统起到非常重要的封盖作用。正是由于大民屯凹陷有严密的封盖体系才保证了其油气的高效聚集。The Damintun Sag in Liaohe Depression is a famous high pour-point oil production base.This paper discusses the importance of the two sets of regional mudstone caprocks to the oil and gas accumulation by analyzing the distribution features and sealing property of caprock.The study on the fluid overpressure shows that there are two fluid overpressure sealing systems which correspond to the two sets of caprocks.The overpressure sealing system plays an important role in oil and gas migration and accumulation.This sag can be divided into two petroliferous systems,the high wax petroleum system and the normal one.These two regional systems seal the high wax petroleum system and the normal system respectively.It is just the sealing systems which ensure the abundant oil and gas accumulation in Damintun Sag.

关 键 词：盖层 大民屯凹陷 油气系统 古近系 高蜡油 封盖作用 辽河坳陷 高凝油 超压 油气富集 

分 类 号：P618[天文地球—矿床学] TE122[天文地球—地质学]